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<1…16171819202122…34>
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... a normal drive without the ram and updated rom and I ... interface works on the plus expansion connector and works with the ...
    caver99 caver99 December 2017 Hardware
  • Better graphic in new ZX gamesLCD TV (ideally full hd) used with ZX Spectrum enable using new graphic modes with 2x higher vertical resolution, more colors and without attribute c…

    ... ) and 1.5kB of free ram memory. I have small idea ... DIVMMC interface one 8kB ram page for this expansion...

    Download ...
    velesoft velesoft September 2018 New game ideas
  • Better graphic in new ZX gamesLCD TV (ideally full hd) used with ZX Spectrum enable using new graphic modes with 2x higher vertical resolution, more colors and without attribute c…

    ... ) and 1.5kB of free ram memory. I have small idea ... DIVMMC interface one 8kB ram page for this expansion...

    Download ...
    velesoft velesoft September 2018 New game ideas
  • Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…

    ...
    Remapping memory, be it RAM or ROM is relatively simple ... the ROM and lower RAM area, but 74 series ... the upper 32k of RAM. The board design is ... Indeed, there was an internal expansion board that upgraded a 16k ... Spectrum with 80k of RAM and a built in ...
    1024MAK 1024MAK February 2019 Hardware
  • Atari ST Thread.I've just purchased a 4mb upgrade for my Atari STe. I always loved my STe, which I got in 1990, amost as much as my ZX spectrum. Way back in 1991 I h…

    ... more than 1M bytes of RAM. I think there are some ... than 1M bytes of RAM.

    But expansion above 1M bytes ... did allow the effective use of RAM disks ...
    1024MAK 1024MAK March 2019 Chit chat
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... white screen? I know sometimes ram chips can be faulty, or ... interface that goes into the expansion port on a Spectrum. It ... if the Spectrum has faulty ram IC's. The diagnostic rom ... with 1 or more lower ram IC's. But the other ...
    Your Spec-chum Your Spec-chum August 2019 Hardware
  • The Different Approaches To Upgrading the ZX Spectrum from 16K to 48K This is probably something that has been covered before . I will take a look to see if I can find anything on WOS

    ... referred to these as "internal RAM boards" ( probably the same thing ... /technical/issue-1-diy-32k-expansion-board/"]https://spectrumforeveryone.com/technical ... /issue-1-diy-32k-expansion-board/[/url]

    But ...
    harriusherbartio harriusherbartio October 2019 Hardware
  • Issue One (2020)My version of the Issue One PCB under development: [img]http://fotogalleria.info/pub/ZXSpeccy/IssueOne/ZXi1_PCB_01.jpg[/img] [img]http://fotoga…

    ... bytes of RAM on board. For the 32k bytes of expansion/extension ... (normally called ‘upper’ RAM nowadays), you plugged ...
    1024MAK 1024MAK May 2020 Hardware
  • Issue One (2020)My version of the Issue One PCB under development: [img]http://fotogalleria.info/pub/ZXSpeccy/IssueOne/ZXi1_PCB_01.jpg[/img] [img]http://fotoga…

    ... in). The expansion board with the 32k of extension RAM fits into ... main board for all the RAM chips. 16k models normally had ... 48k normally had all the RAM chips soldered in.

    1024MAK 1024MAK May 2020 Hardware
  • Video: Inves Spectrum+ A Rare ZX Spectrum+ CloneHere I have a look at the Inves Spectrum+, an interesting Sinclair ZX Spectrum+ clone by Investronica, the same company that designed the ZX Spectrum…

    ... are not present on the expansion port (along with 12V and ... FE writes conflict with the RAM
    - RAM corruption during refresh cycles ...
    Renegade Renegade June 2020 Hardware
  • Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…

    ... and was not possible. The expansion/edge-connector port simply does ... (bank/page) any of the RAM (unlike in the earlier ZX81 ...
    1024MAK 1024MAK July 2020 Hardware
  • ZX80/81 expansions for sale.Hi, I have a Datel Joystick expansion and 16K RAM expansion (boxed with Polys) for the ZX80/81 for sale. Price: Datel Joystick = €15 16K RA…

    ... for the tips. The Datel expansion came with a ZX81 bundle ... had a ZX Spectrum. The RAM Pack is an original Sinclair ... ://www.worthpoint.com/worthopedia/16k-ram-sinclair-zx81-zx80-slightly-242417690 ... the polys).
    The Datel expansion is one of these: https ...
    Bryce Bryce November 2020 Sales
  • If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…

    ... starting thinking I wanted an expansion port, and since I'm ... paging logic to manage the RAM and paged-ROM, with modes ...
    cj7hawk cj7hawk February 2021 Hardware
  • If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…

    ... the system uses shadow video ram anyway.

    My ... if it's on an expansion card. Adding a microdrive is ... support modes to switch in RAM over the ROM space anyway ... I am using a 512K RAM chip so I was ... or so K.

    RAM can always be mapped to ...
    cj7hawk cj7hawk February 2021 Hardware
  • Missed opportunities in the 80'sAll the talk of the Loki got me thinking... What if someone had built an expansion box for the speccy that had the 3812 Yamaha music chip ( Adlib Sou…

    ... a faster Z80 in the expansion and then use the existing ... (or more) of its own RAM and have a better display ... , the same problem exists. The expansion will only sell in large ...
    1024MAK 1024MAK September 2021 Hardware
  • Missed opportunities in the 80'sAll the talk of the Loki got me thinking... What if someone had built an expansion box for the speccy that had the 3812 Yamaha music chip ( Adlib Sou…

    ... list][*]The various 16k byte RAM packs for the ZX81 (mainly ... /> And apart from 32k RAM packs for the 16K model ... plug in an expansion that upped the RAM, had a ... disk drive. Such an expansion if it could run ... br /> [*]80k bytes of RAM as standard[/list]
    ...
    1024MAK 1024MAK September 2021 Hardware
  • More "What could have been"... The Z280.So in chasing up the Loki specs, I happened upon some parallel developments... And had Sinclair gotten to make the Loki, there could have been some i…

    ... keyboards.

    * The zx expansion bus can't be run ... profiles -- one used when the expansion bus is off for software ... to external device, turn off expansion bus. This is to allow ... expansion bus /romcs signal. This is a problem if you allow ram ...
    Alcoholics Anonymous Alcoholics Anonymous October 2021 Hardware
  • More "What could have been"... The Z280.So in chasing up the Loki specs, I happened upon some parallel developments... And had Sinclair gotten to make the Loki, there could have been some i…

    ... , with lots of expansion, and multiple modules for RAM, Function etc ) than ... could be used as an expansion for an original 48K, then ... they then added in the RAM pages that we didn't ...
    cj7hawk cj7hawk October 2021 Hardware
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... in original spec )
    4. Expansion RAM card.
    5. Synth Board ...
    cj7hawk cj7hawk October 2021 Hardware
  • How many interfaces can be paired up together (as a combo) on the Speccy's back edge connector?Well some would say none as it puts too much of a power strain on the Speccy's power supply . So ignoring this aspect the same question can be asked …

    ... did a kit for an expansion board, that included a back ... memory such as ROM or RAM.

    Officially, you could ...
    1024MAK 1024MAK January 2022 Hardware
  • Are 128K games more likely to crash than 48K ones?Hey, guys. I've been doing some experimenting with various games and even some music demos and apps, and I'm beginning to reach a conclusion that …

    ... switches ROM and/or RAM banks into/out of ... the 16K of ‘lower’ RAM still comes from one set ... the 32K of ‘upper’/‘expansion’ RAM still comes from the other ... set of 64K byte RAM chips.

    ... to load in a diagnostic/RAM test program.

    1024MAK 1024MAK February 2022 Games
  • Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…

    ... the lower part of the RAM is slower because of the ...
    Anders Anders September 2001 Emulators
  • Kempston InterfacesWhat Kempston Interfaces featured an additional expansion port on the back, so that you could fit other devices on, such as the Currah microspeech et…

    What Kempston Interfaces featured an additional expansion port on the back, so that you could fit other devices on, such as the Currah microspeech etc?
    Spector Spector January 2002 Sinclair Miscellaneous
  • Thanks for the memories... is it 16k or 48k? Hi. At three different flea markets in Gothenburg, Sweden I found just as many Spectrums... (and a ZX81! [img]/__forums/images/smiles/icon_smile.gif…

    ... out the size of their RAM-memory?

    Most basic ...
    Lars Lindblad Lars Lindblad January 2002 Sinclair Miscellaneous
  • a questionwho can tell us the peek-poke address of the ZX Spectrum Ram Top??

    who can tell us the peek-poke address of the ZX Spectrum Ram Top??
    Andy Andy April 2001 Sinclair Miscellaneous
  • RGB or Composite out of a Spectrum Plus?Anyone know of a way? I dont mind soldering ect. I also heard that their was composite on the expansion bus(Anyone confirm?) Anyone know of a way?

    Anyone know of a way?

    I dont mind soldering ect. I also heard that their was composite on the expansion bus(Anyone confirm?)

    Anyone know of a way?
    Keith Coles Keith Coles March 2001 Sinclair Miscellaneous
  • Z88I Have a Working Z88 complete with 128k EPROM Pack, 128K RAM Pack, Soft Carry Case, PSU, Printer Cable and Manual. I also have Spare:- 1 off 32K…

    ... with 128k EPROM Pack, 128K RAM Pack, Soft Carry Case, PSU ... :-

    1 off 32K RAM Pack

    1 off ...
    Colin Carter Colin Carter July 2001 Sales
  • I have...I still have a working ZX-81 plus 16k RAM pack, still in it's box. I also have a ZX Spectrum 48k computer with the Sinclair Microdrive (plus Microdr…

    ... working ZX-81 plus 16k RAM pack, still in it's ...
    S S May 2001 Sales
  • Didaktik M (ZX Spectrum clone selling)Here is an offer to buy ZX Spectrum clone ( DIDAKTIK M ) from Slovakia, basic info: 100% functionality, Kempston & Sinclair joysticks connectors, tap…

    Here is an offer to buy ZX Spectrum clone ( DIDAKTIK M ) from Slovakia, basic info: 100% functionality, Kempston & Sinclair joysticks connectors, tape device connector, TV and VIDEO out, 48kB RAM/ 16kB ROM. Price GBP 50.
    peter peter January 2001 Sales
<1…16171819202122…34>

Latest Posts

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  • Fixed Speccy Software. And which games remained unfixed?
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  • I am currently watching.....
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    mel the bell on April 21
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HitBox

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ram 12.6K 21.4K
expansion 1.9K 2.3K

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